msm: mdss: fix overlay set issue on 8x10

The driver was assuming the color format and resolution
of the overlay to be the same as frame buffer.  This
causes page fault and corruption if the client is using
a different color format or resolution.   The change is
to re-configure the dma pipe if the overlay configuration
is different from the default.

Change-Id: Ic7558811a3015a416b2428fb0d626bf13663e528
Signed-off-by: Xiaoming Zhou <zhoux@codeaurora.org>